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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Control System (M20A-FKS) - Circuit Tests (5 Of 6)) >> SFI System >> Starter Signal Circuit [09/2022 - 11/2022] >> Procedure

Starter Signal Circuit [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK WHETHER ENGINE CAN BE CRANKED 
    1. Check if the engine can be cranked.

      Result

      Result Proceed to
      Engine cannot be cranked A
      Engine can be cranked B

    Result: 

    B 

    See step  23

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Result Proceed to
      NG (for Continuously Variable Transaxle Models) A
      NG (for Manual Transaxle Models) B
      OK C

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  15

    Result: 

    A 

    See step  3

  3. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Inspect the park/neutral position switch assembly.

      Refer to INSPECTION [06/2018 - 09/2024]

      Result

      Result Proceed to
      OK (w/ Smart Key System) A
      OK (w/o Smart Key System) B
      NG C

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for TMMMS Made)

      Tester Connection Condition Specified Condition
      O62-2 (STAR) - C62-4 (B) Always Below 1 Ω
      O62-2 (STAR) - A47-23 (NSW) Always Below 1 Ω
      O62-2 (STAR), C62-4 (B) or A47-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Standard Resistance (for TMC Made)

      Tester Connection Condition Specified Condition
      O175-10 (STAR) - C62-4 (B) Always Below 1 Ω
      O175-10 (STAR) - A47-23 (NSW) Always Below 1 Ω
      O175-10 (STAR), C62-4 (B) or A47-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the ECM connector.
    4. Disconnect the TCM connector (for TMMMS Made).
    5. Disconnect the certification ECU (smart key ECU assembly) connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for TMMMS Made)

      Tester Connection Condition Specified Condition
      O62-1 (STA) - 1 (ST relay) Always Below 1 Ω
      C62-5 (L) - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      C80-28 (STA) - 1 (ST relay) Always Below 1 Ω
      O62-1 (STA), 1 (ST relay), C62-5 (L), A47-30 (STA) or C80-28 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Standard Resistance (for TMC Made)

      Tester Connection Condition Specified Condition
      O175-1 (STA) - 1 (ST relay) Always Below 1 Ω
      C62-5 (L) - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      O175-1 (STA), 1 (ST relay), C62-5 (L) and A47-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART KEY SYSTEM 

    for TMMMS Made: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - 11/2022]

    for TMC Made: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY 
    1. Inspect the ignition or starter switch assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

    Refer to REMOVAL [01/2019 - ]

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM) 
    1. Disconnect the ignition or starter switch assembly connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I12-5 (ST1) - C62-4 (B) Always Below 1 Ω
      I12-5 (ST1) - A47-23 (NSW) Always Below 1 Ω
      I12-5 (ST1), C62-4 (B) or A47-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the ECM connector.
    4. Disconnect the TCM connector (for TMMMS Made).
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for TMMMS Made)

      Tester Connection Condition Specified Condition
      C62-5 (L) - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      C80-28 (STA) - 1 (ST relay) Always Below 1 Ω
      C62-5 (L), 1 (ST relay), A47-30 (STA) or C80-28 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Standard Resistance (for TMC Made)

      Tester Connection Condition Specified Condition
      C62-5 (L) - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      C62-5 (L), 1 (ST relay) or A47-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. INSPECT CLUTCH START SWITCH ASSEMBLY 
    1. Inspect the clutch start switch assembly.

      Refer to INSPECTION [01/2019 - 11/2022]

      Result

      Result Proceed to
      OK (w/ Smart Key System) A
      OK (w/o Smart Key System) B
      NG C

    Result: 

    B 

    See step  12

    Result: 

    C 

    REPLACE CLUTCH START SWITCH ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY - ECM) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the clutch start switch assembly connector.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O62-2 (STAR) - A60-2 Always Below 1 Ω
      O62-2 (STAR) - A47-23 (NSW) Always Below 1 Ω
      O62-2 (STAR), A60-2 or A47-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the clutch start switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the ECM connector.
    4. Disconnect the certification ECU (smart key ECU assembly) connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O62-1 (STA) - 1 (ST relay) Always Below 1 Ω
      A60-1 - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      O62-1 (STA), 1 (ST relay), A60-1 or A47-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART KEY SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY 
    1. Inspect the ignition or starter switch assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

    Refer to REMOVAL [01/2019 - ]

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY - ECM) 
    1. Disconnect the ignition or starter switch assembly connector.
    2. Disconnect the clutch start switch assembly connector.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I12-5 (ST1) - A60-2 Always Below 1 Ω
      I12-5 (ST1) - A47-23 (NSW) Always Below 1 Ω
      I12-5 (ST1), A60-2 or A47-23 (NSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT) 
    1. Disconnect the clutch start switch assembly connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A60-1 - 1 (ST relay) Always Below 1 Ω
      A47-30 (STA) - 1 (ST relay) Always Below 1 Ω
      A60-1, 1 (ST relay) or A47-30 (STA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. INSPECT ST RELAY 
    1. Inspect the ST relay.

      Refer to INSPECTION [06/2018 - 03/2023]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ST RELAY 

    Result: 

    OK 

    See step  16

  16. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the starter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (ST relay) - C82-1 (ST) Always Below 1 Ω
      3 (ST relay) or C82-1 (ST) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. CHECK TERMINAL VOLTAGE (BATTERY - STARTER ASSEMBLY) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the cable from the positive (+) battery terminal.
    3. Disconnect the starter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Positive (+) battery terminal - C111-1 (B) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) 

    for TMMMS Made 

    GTY830844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
    *2 ST Relay

    for TMC Made 

    GTY1107513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
    *2 ST Relay
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (ST relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY) 

    Result: 

    OK 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (ST relay) - Body ground Always Below 1 Ω

      Result

      Result Proceed to
      OK (for Continuously Variable Transaxle Models) A
      OK (for Manual Transaxle Models) B
      NG C

    Result: 

    B 

    See step  22

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST relay) - C62-5 (L) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  22. CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the clutch start switch assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST relay) - A60-1 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  23. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    5. Check the value displayed on the Techstream when the ignition switch is turned to the ON and START positions.

      OK

      Condition Techstream Display (Starter SW)
      Ignition switch ON OFF
      Engine started ON

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM) 

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